Jacketed mold



Jan. 28, 1930. .R. w. BROWN JACKETED MOLD 2 Sheets-Sheet Filed March 16 1928 lNI ENTOR, W. 5 r0 wn.

ATTORNEYJ'.

Jan, 28, 1930. w, BROWN 1,745,146

JACKETEID MOLD FiledMarch 16, 923 ZSheets-Sheet 2 INVEN TOR. Roy WBTOWK.

A TTORNE YJ',

Patented Jan. 28, 1930 UNITED STATES PATENT OFFICE ROY W. BROWN, 01 AKRON, OHIO, ASSIGNOR TO THE FIBESTONE 'IIBE AND RUBBER COMPANY, OF AKRON, OHIO, A CORPORATION OF OHIO JACKETED MOLD Application filed March 16, 1928. Serial No. 262,134. i

This invention is to provide a jacketed r molds such as are used for vulcanizing tires.

The general urpose of the invention is to provide a jac eted mold construction in which the pressure of a fluid'curing medium is efiectively used to force the molding surfaces together.

More particularly, the invention has for its object the provision of a sectional mold, the sections of which are arranged to be held together by suitable means and at least one of which sections is jacketed, a wall or walls of the jacket being flexible whereby the molding surface of said section is urged against 5 the other-mold section by pressure of a fluid medium such as the curing medium.

The foregoing and other objects are obtained by the construction illustrated in the accompanying drawings and described below. It is to be understood that the invention is not limited to the specific form thereof dis closed herein.

Of the accompanying drawings:

Figure 1 isa plan view of a jacketed vulcanizing mold embodying the principles of the invention; J v A Figure 2 is a transverse vertical section thereof; 1

Figure 3 is an enlarged scale sectional detail taken on the line 33 of Figure 1;

Figure 4 is a diagrammatical elevation of a layout; and v Figure 5 is an end view thereof. Referring to the drawings by reference numerals, 10 represents the lower casing or wall of a steam jacket positioned about a mold half 11. The upper half of the mold consists of an inner mold wall 12 having a heating medium chamber formed thereabout by jacket wall 13. Wall 10 is provided with a circumferential flange 14 carrying annular locking ring 15 forvuniting the upper and lower sectionsof the mold, the upper portion of the locking ring being provided with a series of arcuate lugs 16 adapted to pass between arcuate lugs'17 on the upper mold half.

When the upper half or lid of the mold is assembled with the lower half, the mold parts may then be locked together by swinging lid is raised.

The lower half of the mold wall is constructed to have a slight vertical movement relatively to theupper mold half in order that the pressure of the heating medium in the the lower chamber of the 'acket may force the lower mold half tightly into engagement 25, 25 to permit flexing thereof when'the mold a with the upper section. This construction permits the perfect formation of the tread design on the tire and at the same time prevents the formation of'the fin of rubber about the periphery of the tire.

Independent movability of the lower mold half 11 is obtained by forming a thin bellows portion 27 in the web which connects mold half 11 to the jacket 10, movement of the mold half being limited by cooperating stop members 28 formed on the adjacent portions 10 and 11. The space between the periphery of mold half 10 and the jacket 11 is sealed by a flexible diaphragm 29 backed up by segmental pressure resisting plates 30 held in lace by clamping rings.

Vhen the fluid pressure of the heating medium is built up in the lower chamber the lower mold half is forcibly urged against the being placed side by side. A lifting jack 32 canizing temperatures is next admitted to the jackets to effect-the cure and to force the lower mold half tightly against the upper mold cavity, suitable air bag connections with valve stem 37 being also made. After the cure has been completed, the locking ring 15 is rotated to release the upper mold half which is then raised by the jack to permit the removal of the tire from the mold.

Modifications of the structure herein disclosed may be resorted to without departing from the spirit of the invention or the scope thereof as defined by the appended claims.

What is claimed is:

1. Vulcanizing apparatus comprising a pair of cooperating jacketed mold sections having fluid heating medium chambers therein. and flexible walls provided about the chamber of one of said mold sections to permit the pressure of the heating medium introduced therein to force the latter mold section relatively towards the other mold section.

2. Vulcanizing apparatus comprising a pair of cooperating jacketed mold sections having fluid heating medium chambers therein. means for holding said mold sections substantially together, and a bellows Wall defining the chamber in one section whereby the pressure of the heating medium introduced therein forces the mold sections relatively together.

3. Vulcanizing apparatus comprising a pair of opposed cooperating jacketed mold sections having fluid heating medium chambers therein, a bellows wall, and a flexible diaphragm. respectively, on opposite sides of the cavity in one mold section and defining the chamber therein, whereby the pressure of the heating medium introduced therein forces the mold cavity relatively towards the other mold section.

4. Vulcanizing apparatus comprising a pair of jacket members adapted to be clamped together, a mold section fixed to one of said jacket members to define a heating medium chamber therein, a mold section connected to the other jacket member to define a heating medium chamber therein, a flexible wall connecting one of said mold sections to its jacket member whereby the pressure of a fluid heating'medium introduced in the last mentioned part toward the other mold part.

ROY W. BROWN. 

